#include "Target/ARM/MCTargetDesc/ARMAsmBackend.h"

Inheritance diagram for llvm::ARMAsmBackend:

Public Member Functions
	ARMAsmBackend (const Target &T, llvm::endianness Endian)

bool	hasNOP (const MCSubtargetInfo *STI) const

std::optional< MCFixupKind >	getFixupKind (StringRef Name) const override
	Map a relocation name used in .reloc to a fixup kind.

MCFixupKindInfo	getFixupKindInfo (MCFixupKind Kind) const override
	Get information on a fixup kind.

bool	shouldForceRelocation (const MCFixup &Fixup, const MCValue &Target)

unsigned	adjustFixupValue (const MCAssembler &Asm, const MCFixup &Fixup, const MCValue &Target, uint64_t Value, bool IsResolved, MCContext &Ctx, const MCSubtargetInfo *STI) const

std::optional< bool >	evaluateFixup (const MCFragment &, MCFixup &, MCValue &, uint64_t &) override

void	applyFixup (const MCFragment &, const MCFixup &, const MCValue &Target, uint8_t *Data, uint64_t Value, bool IsResolved) override

unsigned	getRelaxedOpcode (unsigned Op, const MCSubtargetInfo &STI) const

bool	mayNeedRelaxation (unsigned Opcode, ArrayRef< MCOperand > Operands, const MCSubtargetInfo &STI) const override
	Check whether the given instruction (encoded as Opcode+Operands) may need relaxation.

const char *	reasonForFixupRelaxation (const MCFixup &Fixup, uint64_t Value) const

bool	fixupNeedsRelaxationAdvanced (const MCFragment &, const MCFixup &, const MCValue &, uint64_t, bool) const override
	Target specific predicate for whether a given fixup requires the associated instruction to be relaxed.

void	relaxInstruction (MCInst &Inst, const MCSubtargetInfo &STI) const override
	Relax the instruction in the given fragment to the next wider instruction.

bool	writeNopData (raw_ostream &OS, uint64_t Count, const MCSubtargetInfo *STI) const override
	Write an (optimal) nop sequence of Count bytes to the given output.

unsigned	getPointerSize () const

Public Member Functions inherited from llvm::MCAsmBackend
	MCAsmBackend (const MCAsmBackend &)=delete

MCAsmBackend &	operator= (const MCAsmBackend &)=delete

virtual	~MCAsmBackend ()

void	setAssembler (MCAssembler *A)

MCContext &	getContext () const

bool	allowAutoPadding () const
	Return true if this target might automatically pad instructions and thus need to emit padding enable/disable directives around sensative code.

bool	allowEnhancedRelaxation () const
	Return true if this target allows an unrelaxable instruction to be emitted into RelaxableFragment and then we can increase its size in a tricky way for optimization.

virtual void	reset ()
	lifetime management

std::unique_ptr< MCObjectWriter >	createObjectWriter (raw_pwrite_stream &OS) const
	Create a new MCObjectWriter instance for use by the assembler backend to emit the final object file.

std::unique_ptr< MCObjectWriter >	createDwoObjectWriter (raw_pwrite_stream &OS, raw_pwrite_stream &DwoOS) const
	Create an MCObjectWriter that writes two object files: a .o file which is linked into the final program and a .dwo file which is used by debuggers.

virtual std::unique_ptr< MCObjectTargetWriter >	createObjectTargetWriter () const =0

virtual unsigned	getMinimumNopSize () const
	Returns the minimum size of a nop in bytes on this target.

virtual unsigned	getMaximumNopSize (const MCSubtargetInfo &STI) const
	Returns the maximum size of a nop in bytes on this target.

virtual bool	writeNopData (raw_ostream &OS, uint64_t Count, const MCSubtargetInfo *STI) const =0
	Write an (optimal) nop sequence of Count bytes to the given output.

virtual bool	finishLayout (const MCAssembler &Asm) const

virtual uint64_t	generateCompactUnwindEncoding (const MCDwarfFrameInfo FI, const MCContext Ctxt) const
	Generate the compact unwind encoding for the CFI instructions.

bool	isDarwinCanonicalPersonality (const MCSymbol *Sym) const

void	maybeAddReloc (const MCFragment &, const MCFixup &, const MCValue &, uint64_t &Value, bool IsResolved)

virtual bool	fixupNeedsRelaxation (const MCFixup &Fixup, uint64_t Value) const
	Simple predicate for targets where !Resolved implies requiring relaxation.

virtual bool	relaxAlign (MCFragment &F, unsigned &Size)

virtual bool	relaxDwarfLineAddr (MCFragment &) const

virtual bool	relaxDwarfCFA (MCFragment &) const

virtual std::pair< bool, bool >	relaxLEB128 (MCFragment &, int64_t &Value) const

Additional Inherited Members
Static Public Member Functions inherited from llvm::MCAsmBackend
static const MCSubtargetInfo *	getSubtargetInfo (const MCFragment &F)

Public Attributes inherited from llvm::MCAsmBackend
const llvm::endianness	Endian

Protected Member Functions inherited from llvm::MCAsmBackend
	MCAsmBackend (llvm::endianness Endian)

Protected Attributes inherited from llvm::MCAsmBackend
MCAssembler *	Asm = nullptr

bool	AllowAutoPadding = false

bool	AllowEnhancedRelaxation = false

Detailed Description

Definition at line 20 of file ARMAsmBackend.h.

Constructor & Destructor Documentation

◆ ARMAsmBackend()

llvm::ARMAsmBackend::ARMAsmBackend	(	const Target &	T,
		llvm::endianness	Endian
	)

inline

Definition at line 22 of file ARMAsmBackend.h.

Member Function Documentation

◆ adjustFixupValue()

unsigned ARMAsmBackend::adjustFixupValue	(	const MCAssembler &	Asm,
		const MCFixup &	Fixup,
		const MCValue &	Target,
		uint64_t	Value,
		bool	IsResolved,
		MCContext &	Ctx,
		const MCSubtargetInfo *	STI
	)		const

Definition at line 419 of file ARMAsmBackend.cpp.

Referenced by applyFixup().

◆ applyFixup()

void ARMAsmBackend::applyFixup	(	const MCFragment &	F,
		const MCFixup &	Fixup,
		const MCValue &	Target,
		uint8_t *	Data,
		uint64_t	Value,
		bool	IsResolved
	)

overridevirtual

Implements llvm::MCAsmBackend.

Definition at line 1101 of file ARMAsmBackend.cpp.

References adjustFixupValue(), llvm::MCAsmBackend::Asm, assert(), llvm::big, llvm::Data, llvm::MCAsmBackend::Endian, F, Fixup, llvm::MCAsmBackend::getContext(), getFixupKindContainerSizeBytes(), getFixupKindNumBytes(), llvm::MCAsmBackend::getSubtargetInfo(), Idx, llvm::mc::isRelocation(), llvm::little, llvm::MCAsmBackend::maybeAddReloc(), and shouldForceRelocation().

◆ evaluateFixup()

std::optional< bool > ARMAsmBackend::evaluateFixup	(	const MCFragment &	F,
		MCFixup &	Fixup,
		MCValue &	,
		uint64_t &	Value
	)

overridevirtual

Reimplemented from llvm::MCAsmBackend.

Definition at line 1082 of file ARMAsmBackend.cpp.

References llvm::MCAsmBackend::Asm, F, Fixup, llvm::ARM::fixup_arm_thumb_blx, llvm::ARM::fixup_arm_thumb_cp, llvm::ARM::fixup_t2_adr_pcrel_12, llvm::ARM::fixup_t2_ldst_pcrel_12, llvm::ARM::fixup_t2_pcrel_10, llvm::ARM::fixup_t2_pcrel_9, llvm::ARM::fixup_thumb_adr_pcrel_10, and llvm::MCAssembler::getFragmentOffset().

◆ fixupNeedsRelaxationAdvanced()

bool ARMAsmBackend::fixupNeedsRelaxationAdvanced	(	const MCFragment &	,
		const MCFixup &	Fixup,
		const MCValue &	,
		uint64_t	Value,
		bool	Resolved
	)		const

overridevirtual

Target specific predicate for whether a given fixup requires the associated instruction to be relaxed.

Reimplemented from llvm::MCAsmBackend.

Definition at line 315 of file ARMAsmBackend.cpp.

References llvm::MCAsmBackend::Asm, Fixup, needsInterworking(), reasonForFixupRelaxation(), and Sym.

◆ getFixupKind()

std::optional< MCFixupKind > ARMAsmBackend::getFixupKind ( StringRef Name ) const

overridevirtual

Map a relocation name used in .reloc to a fixup kind.

Reimplemented from llvm::MCAsmBackend.

Reimplemented in llvm::ARMAsmBackendELF.

Definition at line 47 of file ARMAsmBackend.cpp.

◆ getFixupKindInfo()

MCFixupKindInfo ARMAsmBackend::getFixupKindInfo ( MCFixupKind Kind ) const

overridevirtual

Get information on a fixup kind.

Reimplemented from llvm::MCAsmBackend.

Definition at line 67 of file ARMAsmBackend.cpp.

References assert(), llvm::MCAsmBackend::Endian, llvm::FirstTargetFixupKind, llvm::MCAsmBackend::getFixupKindInfo(), llvm::mc::isRelocation(), llvm::little, and llvm::ARM::NumTargetFixupKinds.

◆ getPointerSize()

unsigned llvm::ARMAsmBackend::getPointerSize ( ) const

inline

Definition at line 63 of file ARMAsmBackend.h.

◆ getRelaxedOpcode()

unsigned ARMAsmBackend::getRelaxedOpcode	(	unsigned	Op,
		const MCSubtargetInfo &	STI
	)		const

Definition at line 182 of file ARMAsmBackend.cpp.

References llvm::MCSubtargetInfo::hasFeature().

Referenced by mayNeedRelaxation(), and relaxInstruction().

◆ hasNOP()

bool llvm::ARMAsmBackend::hasNOP ( const MCSubtargetInfo * STI ) const

inline

Definition at line 25 of file ARMAsmBackend.h.

References llvm::MCSubtargetInfo::hasFeature().

Referenced by writeNopData().

◆ mayNeedRelaxation()

bool ARMAsmBackend::mayNeedRelaxation	(	unsigned	Opcode,
		ArrayRef< MCOperand >	Operands,
		const MCSubtargetInfo &	STI
	)		const

overridevirtual

Check whether the given instruction (encoded as Opcode+Operands) may need relaxation.

Reimplemented from llvm::MCAsmBackend.

Definition at line 205 of file ARMAsmBackend.cpp.

References getRelaxedOpcode().

◆ reasonForFixupRelaxation()

const char * ARMAsmBackend::reasonForFixupRelaxation	(	const MCFixup &	Fixup,
		uint64_t	Value
	)		const

◆ relaxInstruction()

void ARMAsmBackend::relaxInstruction	(	MCInst &	Inst,
		const MCSubtargetInfo &	STI
	)		const

overridevirtual

Relax the instruction in the given fragment to the next wider instruction.

Parameters

[out]	Inst	The instruction to relax, which is also the relaxed instruction.
	STI	the subtarget information for the associated instruction.

Reimplemented from llvm::MCAsmBackend.

Definition at line 329 of file ARMAsmBackend.cpp.

References llvm::MCInst::addOperand(), assert(), llvm::MCOperand::createImm(), llvm::MCOperand::createReg(), llvm::MCInst::getOpcode(), getRelaxedOpcode(), and llvm::MCInst::setOpcode().

◆ shouldForceRelocation()

bool ARMAsmBackend::shouldForceRelocation	(	const MCFixup &	Fixup,
		const MCValue &	Target
	)

Definition at line 936 of file ARMAsmBackend.cpp.

References llvm::MCAsmBackend::Asm, Fixup, llvm::ARM::fixup_arm_blx, llvm::ARM::fixup_arm_condbl, llvm::ARM::fixup_arm_thumb_blx, llvm::ARM::fixup_arm_uncondbl, needsInterworking(), and Sym.

Referenced by applyFixup().

◆ writeNopData()

bool ARMAsmBackend::writeNopData	(	raw_ostream &	OS,
		uint64_t	Count,
		const MCSubtargetInfo *	STI
	)		const

overridevirtual

Write an (optimal) nop sequence of Count bytes to the given output.

If the target cannot generate such a sequence, it should return an error.

Returns: - True on success.

Implements llvm::MCAsmBackend.

Definition at line 352 of file ARMAsmBackend.cpp.

References llvm::MCAsmBackend::Endian, llvm::MCSubtargetInfo::hasFeature(), hasNOP(), OS, llvm::raw_ostream::write(), and llvm::support::endian::write().

The documentation for this class was generated from the following files:

lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h
lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ ARMAsmBackend()

Member Function Documentation

◆ adjustFixupValue()

◆ applyFixup()

◆ evaluateFixup()

◆ fixupNeedsRelaxationAdvanced()

◆ getFixupKind()

◆ getFixupKindInfo()

◆ getPointerSize()

◆ getRelaxedOpcode()

◆ hasNOP()

◆ mayNeedRelaxation()

◆ reasonForFixupRelaxation()

◆ relaxInstruction()

◆ shouldForceRelocation()

◆ writeNopData()